<template>
	<view>
		<view class="search-box">
			<uni-search-bar  @input="input" :radius="100" cancelButton="none" ></uni-search-bar>
		</view>
		
		<!-- 搜索建议列表 -->
		<view class="sugg-list" v-if="searchResults.length !== 0">
			<view class="sugg-item" v-for="(item,i) in searchResults" :key="i" @click="gotoDetail(item)">
				<view class="goods-name">{{item.goods_name}}</view>
				<uni-icons type="arrowright" size="16"></uni-icons>
			</view>
		</view>
		
		<!-- 搜索历史区域 -->
		<view class="history-box" v-else> 
			<!-- 标题区域 -->
			<view class="history-title">
				<text>搜索历史</text>
				<!-- 小标题垃圾桶 -->
				<uni-icons type="trash" size="17" @click="clean"></uni-icons>
			</view>
			<!-- 列表区域 -->
			<view class="history-list">
				<uni-tag  :text="item" v-for="(item,i) in histories" :key="i" customStyle="margin-top: 5px;margin-right: 5px;" @click="gotoGoodList(item)"></uni-tag>
			</view>
		</view>	
	</view>
</template>
	
<script>
	export default {
		data() {
			return {
				timer: null,
				kw: '',
				searchResults: [],
				historyList: [],
				
				
			};
		},
	
		
		methods:{
			//input输入事件
			input(e)
			{
				
				clearTimeout(this.timer)
				//延时防抖函数
				this.timer = setTimeout(()=>{
				this.kw = e
				//根据输入的关键词，查询搜索列表
				this.getSearchList()
				},500)
			},
			
			async getSearchList(){
				//判断搜索关键词是否为空
				if(this.kw.length === 0){
					this.searchResults = []
					return
				}
				
			 const {data : res} = await uni.$http.get('/api/public/v1/goods/qsearch', {query: this.kw})
			 console.log(res)
			 if(res.meta.status !== 200)return uni.$showMsg()
			 this.searchResults = res.message
			 
			 this.saveSearchHistory()
			},
			
			gotoDetail(item){
				uni.navigateTo({
					url:'/subpkg/goods_detail/goods_detail?goods_id=' + item.goods_id
				})
			},
		
			saveSearchHistory(){
				//this.historyList.push(this.kw)
				
//....................................解决历史纪录重复的问题............................................//				
				//将数组转换成set对象
				const set = new Set(this.historyList)
				//将重复的元素删除
				set.delete(this.kw)
				//在添加元素保证元素都在第一位
				set.add(this.kw)
				//最后在把set对象转换成数组，并且保存到historyList
				this.historyList = Array.from(set)
//....................................解决历史纪录重复的问题............................................//				
			
				//将数组转换为字符串  搜索纪录 持久化存储到本地
				uni.setStorageSync('kw',JSON.stringify(this.historyList))
			},
//....................................按钮清空历史纪录.................................................//							
			clean(){
				this.historyList = []
				uni.setStorageSync('kw','[]')
			},
//....................................按钮清空历史纪录................................................//							
		
//...................................点击历史纪录跳转页面.............................................//										
			gotoGoodList(kw){
				
				uni.navigateTo({
					url:'/subpkg/goods_list/goods_list?query='+kw
				})
			},
//...................................点击历史纪录跳转页面.............................................//													
		},
		
		//注意大小写L
		onLoad(){
			//在页面启动时调用本地存储，将保存的历史纪录显示出来
			this.historyList = JSON.parse(uni.getStorageSync('kw')||'[]')
		},
		
		
		computed:{
			histories(){
				//这里新建了一个数组，以免修改原数组中的元素，reverse()反转
				return [...this.historyList].reverse()
			}
			
		}
	}
</script>

<style lang="scss">

.search-box{
	position: sticky;
	top: 0;
	z-index: 999;
}

.sugg-list{
		padding: 0 5px;
		.sugg-item{
			display: flex;
			align-items: center;
			justify-content: space-between;
			font-size: 12px;
			padding: 13px 0;
			border-bottom: 1px solid #efefef;
			.goods-name{
				white-space: nowrap;
				overflow: hidden;
				text-overflow: ellipsis;
				
			}
		}
	}

.history-box{
	padding: 0 5px;
	
	.history-title{
		display: flex;
		justify-content: space-between;
		height: 40px;
		align-items: center;
		font-size: 13px;
		border-bottom: 1px solid #efefef;
	}
	.history-list{
		display: flex;
		flex-wrap: wrap;
		
		
	}
}	
	
</style>
